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27 October 2003 • AGE-NC Project No 98-0450 ' Page 12 of 17 580 milligrams per kilogram (mg/kg) TPH-d was detected In three soil samples at a maximum concentration of 800 mg/kg(CB 1-3 5) TBA was detected In two soil samples,CBI-25 and C131-30, at concentrations of 260 microgram per kilogram (µg/kg) and 590 µg/kg, respectively No other target analytes were detected In the samples analyzed Confirmation soil sample analytical results are summarized In Tables 1 and 2 F TPH-g and TPH-d were detected In confirmation soil samples collected from boring CBI at ' maximum concentrations of 580 mg/kg and 800 mg/kg,respectively, pnor to SVE remediation,the maximum TPH-g concentration In soil at the Immediately adjacent well BMW-4 was 9,600 mg/kg (sample SB4-15) BTEX compounds and MTBE were not detected In bonng CB1, compared to ' maximum BTEX concentrations of 24 mg/kg benzene,520 mg/kg toluene, 190 mg/kg ethylbenzene and 1,200 mg/kg xylenes and a maximum MTBE concentration of 9 2 mg/kg In adjacent,pre-SVE well BMW-4 (sample S134-15 In Table 2) TBA was detected in bonng CBI at a maximum concentration of 0 59 mg/kg, compared o 6 6 mg/kg In pre-SVE well BMW-4 Prior to SVE remediation, TPH-g, TPH-d and BTEX compounds were detected In soil samples ' . collected at the vapor extraction well VW-1 (SB5), at maximum concentrations of 1,800 mg/kg TPH-g, l 7 mg/kg TPH-d,0 021 mg/kg benzene,7 2 mg/kg toluene,35 mg/kg ethylbenzene and 170 mg/kg xylenes (Table 2), In addition, MTBE and TBA were detected at maximum concentrations ' of 0 095 mg/kg and 0 33 mg/kg,respectively No target analytes were detected 1n the immediately adjacent confirmation soil bonng CB2 ' 52 CONFIRMATION GROUND WATER SAMPLE COLLECTION ' As required to define the lateral extent of dissolved hydrocarbons and fuel additives from the site, two soil borings(CHP I and CHP2)were advanced In the sidewalk on the south side of Lodi Avenue on 23 June 22003 The samples were collect In order to assess the progress of in-situ air-sparging tand soil-vapor extraction The borings were advanced to a total depth of 55 feet bsg utilized a 25-tan truck-mounted CPT dnll ng equipped with 1 50-inch diameter hollow-stern rods A hydraulic ram was utilized to advance a water sampling tool attached to the hollow-stem rod assembly to total depth of each soil boring A HydroPunch ground water sampling tool was attached to the hollow- stem rod assembly and utilized to collect grab ground water samples at top of the water table The ' HydroPunch sample tool was pushed Into the specific depth interval,then withdrawn approximately - fiVe feet to expose an inlet screen The interior o£the-sampling tool filled with water and a 1-inch outer diameter (O D ) stainless steel bailer was lowered and utilized to extract a ground water sample 1 Advanced GeoEavpronmental,Inc